Mesectoblast
中外胚层, 外中胚层
🗣️ 情景例句
Hmmm.
嗯。
You haven't changed a bit!
你一点都没变！
I'm planning to start a school, so I'm trying to save as much money as possible.
我计划开办一所学校，因此我在设法尽可能地多攒钱。